Dependence of the Magnitude of Persistent Photoconductivity on Sodium Content in Cu(In,Ga)Se2 Solar Cells and Thin Films

被引：14
作者：
Czudek, Aniela [1 ]
Urbaniak, Aleksander [1 ]
Eslam, Alexander [2 ]
Wuerz, Roland [2 ]
Igalson, Malgorzata [1 ]
机构：
[1] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland
[2] Zentrum Sonnenenergie & Wasserstoff Forsch Baden, D-70563 Stuttgart, Germany
来源：
IEEE JOURNAL OF PHOTOVOLTAICS | 2020年 / 10卷 / 06期
关键词：
Cu(In-0.7; Ga-0.3)Se-2; (CIGS); drive-level capacitance profiling (DLCP); persistent photoconductivity (PPC); sodium; solar cells; ELECTRICAL CHARACTERISTICS; METASTABLE CHANGES; NA; DEFECTS; METASTABILITIES; DENSITIES; DEVICES; CU(IN; BULK;
D O I：
10.1109/JPHOTOV.2020.3014865
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The persistent photoconductivity (PPC), i.e., the metastable increase in hole concentration due to light soaking in Cu-poor Cu(In-0.7,Ga-0.3)Se-2 solar cells is observed to be proportional to the Na concentration in the absorber layer. Hole concentration in cells and conductivity in thin films follow a similar trend, suggesting that the effect originates from the absorber layer and is somehow linked to sodium concentration. Our results suggest that the large lattice relaxation model of an amphoteric V-Se-V-Cu vacancy complex being responsible for PPC cannot itself explain the Na-PPC relation. Therefore. either the passivation of the grain boundary barriers by sodium or a sodium-related modification of a defect complex needs to be included in the model.
引用
收藏
页码：1926 / 1930
页数：5
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